What is the effect on the magnetic needle in Oersted's experiment, when (1) a current is passed through the wire (2) the current through the wire is increased (3) The current through the wire to stopped (4) The current through the wire is reversed (5) The distance between jthe magnetic needle and the wire is increased , keeping the current through the wire constant ?

Explanation

In Oersted's experiment, when there is no current in the wire, the magnetic needle is at rest along the north-south direction.
(1) When a current is passed through the wire, the needle is deflected.
(2) When the current through the wire is increased, the deflection of the needle increases.
(3) When the current through the wire is stopped, the needle comes to rest in its original position along the north -south direction.
(4) Whne the current through the wire is reversed, the needle is deflected int he direction opposite to that in the first case.
(5) When the distance between the magnetic needle and the wire is increased, keeping the current through the wire constant, the deflection of the deflection of the needle becomes less.